15-7. Crates A and B weigh 100 lb and 50 lb. respectively.
Chapter 15, Problem 15-7(choose chapter or problem)
15-7. Crates A and B weigh 100 lb and 50 lb. respectively. If they start from rest, determine their speed when / = 5 s. Also, find the force exerted by crate A on crate B during the motion. The coefficient of kinetic friction between the crates and the ground is fxk = 0.25.
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